(AP) — Police say a 33-year-old homeless man arrested on suspicion of killing his ex-girlfriend set fire to a tent she was in at a homeless camp south of downtown Omaha.

Police believe Sonny Delong set the fire Tuesday night that killed 30-year-old Amanda Brown.

Brown’s new boyfriend, Michael Witt, says he and Brown were in the makeshift tent when Delong showed up and ordered them out. They refused, and Witt said Delong used a lighter to ignite the structure.

Witt says he then left the tent, but Brown refused. Witt says he tried to dismantle the tent from the outside, but couldn’t. He says that as the fire grew, Brown began to call for help.

Firefighters later found her body among the ashes.