Doug Martin, the RB who made two Pro Bowls while running for over 5,356 yards in a seven-year NFL career with the Raiders and Buccaneers, died last week at the age of 36.

But details have emerged since that news about the man known as "Muscle Hamster" broke, with questions surrounding what exactly happened that led to his untimely passing. There were reports that he died while in the custody of police in Oakland, California.

As the world including his family and loved ones mourn the passing of the talented running back, here's what we know so far after Martin died earlier this week:

Doug Martin was battling mental health challenges, per agent statement

"The family wishes to clarify the circumstances. Doug's parents were actively seeking medical assistance for him and had contacted local authorities for support. Feeling overwhelmed and disoriented, Doug fled his home during the night and entered a neighbor's residence two doors down, where he was taken into custody by police. An investigation into what transpired as he was detained is underway."

What did Oakland police say about the death of Doug Martin?

From SFGate:

Oakland police said they were called for a possible break-in at a residence at the 11000 block of Ettrick Street between the Oakland Zoo and Lake Chabot Golf Course at about 4:15 a.m. on Saturday morning.

According to a news release, OPD said they received simultaneous calls about a person in medical distress, believed to be the same person involved in a break-in.

Per Oakland Police in a statement: "After being taken into custody, Martin became unresponsive. Paramedics responded to the scene, provided medical aid, and transported Martin to a local hospital, where he later died."

Doug Martin's brain will reportedly be tested for CTE

From the Bay Area News Group:

Martin’s brain is being preserved for tests to determine whether he suffered from chronic traumatic encephalopathy, or CTE, authorities confirmed to this news organization on Tuesday. The condition, which can cause erratic behavior and severe mental illness, is associated with repeated head trauma and has been found in hundreds of former NFL players in recent years.

This article originally appeared on For The Win: What happened to Doug Martin? Latest updates with details emerging

Reporting by Charles Curtis, For The Win / For The Win

USA TODAY Network via Reuters Connect