Police say they don’t yet know why or how a Duluth man was killed inside his home last week.

The key to unlocking the mystery: Don Singer’s missing red Porsche, according to investigators.

Singer, 57, was found by his daughter Thursday afternoon wrapped in blankets inside his garage on Montheath Pass. He was last seen March 23, according to Duluth police.

“I just tried calling him, I tried calling him for three days, four days and he wouldn’t answer,” Singer’s friend, Noverto Maltos, told Channel 2 Action News.

Duluth Police Capt. Mark Hunter said investigators are awaiting toxicology results along with additional forensic testing before determining a cause of death.

Even though the victim’s 1988 Porsche 944, with a Georgia tag ADK 6725, is missing, police won’t say whether robbery was the motive for the slaying.

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