The 15-year-old’s defense attorney wrote in court filings that his client was defending his mother and younger brother.

Prosecutors charged a Pierce County teenager with second-degree murder after he allegedly stabbed and killed his mother’s boyfriend during a fight in their shared apartment unit.

The man who was fatally stabbed in a Pierce County apartment unit last week has been identified as 23-year-old Malik Session, according to the Medical Examiner’s Office.

The motorcyclist was taken to Tacoma General Hospital where he later died, according to State Patrol. The 22-year-old Bonney Lake driver and his 21-year-old passenger were hurt and taken to Good ...