Day 30 - June 24, 2024

Dr. Frank Sheridan, a retired triple board-certified forensic pathologist and former chief medical examiner of San Bernardino County, California, testifies as a defense expert. After establishing his credentials — approximately 13,000 autopsies, over 400 court qualifications, and extensive experience with pedestrian-vehicle collisions — Sheridan examines photographs of O'Keefe's arm injuries and testifies they lack the bruising expected from a vehicle strike, instead appearing consistent with animal scratch and bite marks. He describes the fatal head laceration to the occipital area, the resulting skull fracture extending to the frontal regions, extensive brain contusions, and fatal brain herniation. Sheridan states the head injury would have caused immediate unconsciousness, was inconsistent with falling onto grass or snow, and that the overall injury pattern — including hand bruising he characterizes as possible defensive injuries — is consistent with a physical altercation.

ADA Lally cross-examines Dr. Frank Sheridan, establishing that Sheridan never performed the autopsy himself and worked solely from photographs and reports. Lally methodically reveals that Sheridan was unaware of several key prosecution evidence items: UC Davis testing found no canine DNA on O'Keefe's sleeve, taillight fragments were found in O'Keefe's clothing, a hair consistent with O'Keefe's DNA was found on the vehicle's rear quarter panel, and the Albert dog's later documented bite history with photographs. Lally elicits concessions that Sheridan cannot identify the type of animal, breed, when the injuries occurred, or where they were inflicted, and that no evidence from the materials Sheridan reviewed showed any animal interacting with O'Keefe. Lally also challenges Sheridan's dismissal of vehicle-strike injuries by exploring frozen ground conditions, projection force, and compression abrasions from taillight components.

Attorney Elizabeth Little conducts a brief redirect of Dr. Frank Sheridan, introducing a photograph showing the deceased John O'Keefe's knees. The photograph, admitted as Exhibit 657, depicts the knee abrasion that was discussed during Lally's cross-examination. Sheridan confirms it shows an abrasion and states that is the extent of the knee injury. The redirect consists of this single evidentiary point before Sheridan is excused.

On redirect, Jackson re-established Wolfe's credentials and independence — Wolfe was retained by a separate federal agency (DOJ/FBI), had never met the defense or prosecution, and formed his own theories from the evidence provided. Wolfe described ARCCA's projectile testing, where a pneumatic cannon fired a drinking glass at 37 mph into an exemplar tail light and replicated the damage pattern seen on the Lexus. He testified that a drop test at 15 mph — already fast for reversing — produced significantly more tail light damage than was observed on the subject vehicle, and that 24 mph would produce roughly 2.5 times more energy and damage. Wolfe further noted the absence of damage in the 20-inch gap between the dent above the lift gate and the broken tail light was inconsistent with an outstretched arm being struck. He concluded the tail light damage was inconsistent with striking a human head or arm.

On recross, ADA Lally systematically established that Wolfe's analysis was based on only 10 items provided to him, and that he was unaware of significant evidence including O'Keefe's DNA on the tail light, mitochondrial DNA from hair on the vehicle's quarter panel, microscopic tail light plastic on O'Keefe's clothing, video of O'Keefe holding a cocktail glass at the bar, the defendant's statements saying 'I hit him,' and Toyota TCH stream data showing the vehicle in reverse. Lally also challenged Wolfe's testing methodology — the rocks glass used was not sourced from the actual bar, temperature preconditioning was not documented in the report, wind conditions during the blizzard were not replicated, and the tail light was not mounted on an actual vehicle. Wolfe acknowledged that shoes coming off is consistent with pedestrian collisions and that a collision at 0-5 mph would not create the observed tail light damage. Lally concluded by re-reading the report's own reservation clause about supplementing findings if additional information became available.

In a brief redirect of just 12 utterances, Jackson asked Wolfe whether the DNA on the tail light housing, hair evidence, and glass material raised during Lally's cross-examination changed any of his opinions. Wolfe responded 'Absolutely not.' Jackson attempted a broader question about whether the vehicle damage and human injuries were consistent with vehicle interaction, but Lally's objection was sustained. Jackson then released the witness.

Dr. Andrew Rentschler, a biomechanical engineer from ARCCA, testified on direct examination by Alan Jackson about his analysis of whether John O'Keefe's injuries could have been caused by contact with Karen Read's Lexus SUV. After establishing his credentials and independence (retained by neither party), Rentschler explained that at 24 mph, a vehicle-pedestrian impact would generate over 1,000 pounds of force and produce fractures, significant soft tissue damage, and cervical spine injuries. He testified that O'Keefe's isolated occipital skull fracture with no cervical spine or other body injuries was inconsistent with being struck by the tail light. Regarding the arm, he noted the abrasions were uniform, superficial, and extended over 12 inches — more than twice the tail light's 6-inch width — which was inconsistent with a tail light strike that would produce deep lacerations, embedded fragments, and a concentrated impact point. Rentschler also explained that striking only an outstretched arm could not project a body 20-30 feet because force must act at center of mass to move the whole body.

ADA Adam Lally cross-examined Dr. Andrew Rentschler, focusing on gaps in the materials provided to ARCCA for their analysis. Lally established that Rentschler never inspected the physical vehicle, never reviewed the State Police reconstruction report or forensic DNA reports, and never examined the actual tail light pieces. Lally confronted Rentschler with evidence discovered after the February 2024 report: DNA consistent with O'Keefe found on the tail light housing, O'Keefe's DNA on a drinking glass near his body, and plastic fragments consistent with the tail light found embedded in O'Keefe's shirt. Lally also elicited that Rentschler did not analyze whether frozen ground could have caused the skull fracture, and that the report's own language acknowledged O'Keefe's head injury was consistent with falling backwards after being pushed or impacted by the Lexus. The defense rested immediately after Rentschler's dismissal.