Lisa Tyler of Binghamton and Shane Katen of Sanford were found dead in Katen's family home.
Both were 18 and Tyler was pregnant.
The Sheriff's office reports the autopsy found Katen had used cocaine and alcohol.
Also, bruises suggest the couple got into a physical fight.
Tyler died from a shotgun wound to the face.
About 6 hours passed before Katen shot and killed himself with a hand gun.
Investigators say he went out with friends, and even told them he shot someone.
The friends didn't believe him.
Katen's father found his son and Tyler dead just after midnight last Friday.
Calling hours for Tyler are Tuesday from 4 to 7 at DeMunn Funeral Home in Binghamton.
They were held for Katen Monday.
Funeral services are private.