In August, Martin checked into Tranquility Rehab Center, a state-licensed, privately run facility set in a mediterranean-style house in the scenic Castro Valley hills. When he arrived, he tested positive for cocaine and methamphetamine, the sheriff's office report said, adding that he also had fentanyl and a hunting knife among his belongings.

Doug Martin 's family is shedding more light on the ex-NFL star's death ... revealing the 36-year-old privately struggled with mental health issues over the years -- and they were actively trying to g...

After being taken into custody, Martin became unresponsive," police said in an update released Monday.