Two men were convicted Friday of murdering a jeweler and four family members in a robbery that netted $3,200 and some jewelry from a safe in the victim’s home, The Associated Press reports.

John Wolfenbarger, 31, and Dennis Lincoln, 27, were found guilty by separate juries. They face a mandatory sentence of life in prison without parole, the AP reports.

Marco Pesce, 38, and his three children, ages 6, 9, and 12, were discovered Dec. 21 in their Livonia, Mich., home (in suburban Detroit), face down in a circle at the foot of the basement stairs, each shot in the back. Pesce’s mother, 68-year-old Maria Vergati was found shot in the chest in the living room.

Police said the killers pretended to deliver a Christmas package to get into the house, where they knew Pesce had a safe filled with money and jewelry. They said the men probably had Pesce under surveillance for days before the murders.

When the gunmen realized the children did not know the combination to the safe, they may have forced Pesce’s 12-year-old son to call his father home from work, prosecutors said.

The verdict against Lincoln was reached last month but was sealed until the verdict against Wolfenbarger was reached on Friday.

JCK