Police arrested a father Tuesday for arson and murder in connection to a South Seattle fire that killed his teenage son. Authorities arrested Mohamed Abdi, 38, on suspicion of murder and arson for an early morning Jan. 22 fire at a home in the 9300 block of 39th Ave. South. Firefighters arrived to find four people who had made it out immediately report there was a fifth person still inside the home. Firefighters raced inside and found the 15-year-old boy gravely injured inside a second-story bedroom and carried him outside as flames raced up the stairwell. The teen died at Harborview Medical Center in Seattle four days later. A private insurance company said there were no signs of electrical failure, electrical combustion or accidental combustion that caused the fire.