Coos Bay Gunman's Motive Unclear

Coos Bay police say they'll probably never know what a 41-year-old man was planning at a motel last weekend with an AR-15 assault rifle, a handgun and hundreds of rounds of ammunition.
The police say Michael Ames of Coos Bay killed himself with a
9mm handgun Sunday and was dead in his room for much of what
appeared to be a six-hour standoff.
The World in Coos Bay reported (http://bit.ly/NjlTTw) there was
no suicide note or other indication what the weaponry was for.
Capt. Cal Mitts says Ames was part of a stalking case involving
an estranged girlfriend.
Officers said they went to the motel to question Ames, and he
fired at them. Hours later, without a response from Ames, officers fired a concussion grenade and broke down the door.