By Brad Segall

HILLTOWN, Pa. (CBS) — One year after a man was murdered inside his Bucks County home, authorities are hoping that the public can provide them with a clue that will crack the case and bring the killers to justice.

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Authorities have released some new information. They say Joseph Canazaro was stabbed to death inside his Hilltown home last January during a violent home invasion.  His girlfriend and his 12-year-old son were tied up (see previous story).

According to police, two men fled to a Quakertown shopping center in Canazaro’s pickup truck, and it’s believed they got into a red Nissan.

That’s where the trail goes cold.

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“At this point we’re grinding through some of the forensic evidence, some of the cell phone evidence, and we’re still hopeful that we’re going to solve this,” says Bucks County prosecutor Matt Weintraub.   “I’m still optimistic.”

Part of the problem, he says, is the large number of working theories they can’t exclude.

Canazaro reportedly was deeply in debt.  Police say the assailants took cash, jewelry, and guns from the Swartley Road home.

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