Celebrity private eye William Dear doesn’t think O.J. Simpson got away with murder.

The real killer is the gridiron great’s troubled oldest son, Jason, theorizes the Texas gumshoe in his latest book, “O.J. Is Innocent and I Can Prove It.”

Dear has spent 17 years de-constructing the murders of Nicole Brown Simpson and Ron Goldman on the night of June 12, 1994.

Digging through his prime suspect’s trash and abandoned storage locker, Dear says a treasure trove of circumstantial evidence points to the 41-year-old son.

According to Dear, among the items he found in the locker were a hunting knife, owned by the “overlooked suspect,” that forensic experts believe is the murder weapon never found by investigators and photos of Jason wearing knit caps similar to one at the crime scene that failed to be linked to his dad.

Dear questions why his suspect was never interviewed by police nor his fingerprints or DNA compared to unidentified ones at the crime scene.

Jason battled with “intermittent rage disorder” and assaulted his girlfriend two months prior to the murders, Dear claims.

He also contends that Jason confesses to having a Jekyll-and-Hyde personality and heavy drug use and cryptically declares “that this is the year of the knife for me” in his diary.

Jason Simpson, a chef who lives in Miami, couldn’t be reached for comment. His phone was disconnected.