John Likins, one of Peter and Pat Likinsâ six children, was pronounced dead early Friday morning from what family members believe to be drug use.

Tucson Police went to John Likinsâ home in the 3100 block of North Swan Road on Thursday after a domestic disturbance call Thursday night, just before 10 p.m.

Five hours later officers returned to John Likinsâ home to serve an outstanding felony arrest warrant. They found him lying on his back between a table and a bed, unresponsive.

John Likins was pronounced dead at 3:23 a.m. Friday. He was 33.

Though his father suspected drugs were involved, the Pima County Medical Examiner had yet to release a report as to the cause of Johnâs death Tuesday morning.

John was one of six children whom Pat and Peter Likins adopted into their multiracial family.

John had struggled with drug abuse and schizophrenia since age 17, Peter Likins told the campus community in an e-mail about his son.

During his adolescent years, John Likins came to behave in increasingly strange ways, Peter Likins told the Chronicle of Higher Education in a 1998 interview.

John would remain in a classroom long after classes had ended, or sit in darkness for hours in the familyâs basement.

Peter Likins once called the police while he was president at Lehigh University to turn his son in to police.

John had been in rehabilitation centers, and had received counseling.

Peter and Pat Likins came to learn that John was schizophrenic after he stole his sisterâs wedding presents.

During this period, Peter Likins submitted his resignation to Lehighâs Board of Trustees, stating that he did not want to hurt the university, according to the Chronicle of Higher Education.

The board talked Likins out of resigning.

In 1997 the Likins family moved to Tucson. Eventually Johnâs life started to turn around ÷ for a time.

ãAlthough he was drug free for the past year, and a part-time student at Pima College, in recent weeks his relapse has been apparent, and crushingly disappointing to us all,ä Peter Likins wrote.

Services for John Likins, who will be cremated, will be held at 10:30 a.m. on Aug. 10 at St. Josephâs Catholic Church, 215 S. Craycroft Rd.

ãJohn has been in great pain for the last half of his life, after living a joyful and exuberant youth. We love him deeply, and cherish our memories. Now his pain is over,ä his father wrote.