Gay activist Keith Kimmel died from a drug overdose, not from injuries he allegedly sustained at the hands of Tulsa, Oklahoma police, according to a coroner's report issued Thursday.

The Office of the Chief Medical Examiner said Kimmel died from acute oxycodone toxicity, reported. Oxycodone is the generic name for OxyContin.

Kimmel was found dead by a friend five days after being “beat up” by police in March.

Kimmel first made headlines last year when he sued the Oklahoma Tax Commission for refusing his request for a personalized 'IM GAY' license plate. He said the right to display his sexuality on a license plate was protected free speech and noted that the state had issued similar plates for straight people, including 'STR8SXI' and 'STR8FAN.'

Two days before his death, Kimmel filed a complaint against Tulsa police in which he claimed that officers called to the scene over the weekend to break up a fight at The End Up Club, a gay stripped bar, “beat him,” made “crude comments about my weight” and “several derogatory remarks were made with regard to my sexual orientation and the entertainers and/or patrons of the bar.”

He called the incident a “blatant hate crime” in the complaint.

Kimmel was taken into custody but never booked. Officers instead drove him to St. John Medical Center.

In his complaint, Kimmel included various photographs of injuries he sustained, including a foot-long bruise on his stomach. The autopsy report does confirm those injuries.