Friends and family hold candles at a vigil remembering the life of Patrick Lobor, 22, after his death in July. Credit: File

Officials have ruled the death of a Portland man killed by a stab wound after a summer car crash a suicide.

The state medical examiner’s office determined that Patrick Lobor, 22, took his own life with a stab to the heart, a spokesman said Monday.

The circumstances of Lobor’s death have been a mystery since he was seen with a knife in his chest following a three-vehicle collision on Riverside Street in July. No one else was killed in the crash.

[Portland man died of stab wound, ‘does not appear suspicious,’ police say]

Local police said soon afterward that the death “does not appear suspicious” but declined to explain further. Lobor’s father disagreed, saying at the time that he respects the police but believed his son’s death involved a crime.

Mark Belserene, an administrator with the medical examiner’s office, said that Portland police did “outstanding work, but this is a suicide.” He said no details beyond the cause and manner of death could be released.

[Family of dead Portland man suspect crime where police see ‘no foul play’]

Robert Lobor confirmed Monday that police had informed him to the medical examiner’s determination but declined to comment further. “I have nothing to say anymore,” he said.

To reach a suicide prevention hotline, call 888-568-1112 or 800-273-TALK (8255), or visit www.suicidepreventionlifeline.org.