Rubincan is a mystery to many. He attended the University of Delaware from 1981 to 1988, but didn't graduate.
In 1993, Rubincan went to work as a medical technologist at Christiana Hospital, where he worked with blood samples but had no contact with patients, hospital spokesman Bill Schmitt said.
In 2008, Rubincan was hired at the Veterans Affairs hospital near Elsmere, keeping a part-time job at Christiana.
Veterans Affairs spokesman Charles Quesenberry said Rubincan continues to be a hospital employee. Christiana Hospital would not comment on his status.
Although he'd lived in his neighborhood for more than six years, he was a stranger there.
Rubincan purchased the $256,000 home in 2003—shortly after selling another home in Bear. The beige-siding home sits on a 0.32-acre lot on the edge of a cul-de-sac in the 100 block of West Cobblefield Court.
No one answered the door on separate occasions.
Although he was friendly enough to wave hello or goodbye and occasionally talk about gardening with a neighbor, Rubincan kept to himself. On occasion, he had friends over, some of whom were seen shirtless while exercising or meditating outside the house.
"There were times in the better weather, like in the summer, where I saw some young people out there and they were horsing around," said Mancini, who lives across the street from Rubincan. "They were having a water fight. It looked like three or four guys."
For more than 20 years, Rubincan has been a member of the University of Delaware Figure Skating Club, which is open to the public. Rubincan qualified for the 1999 U.S. Adult Figure Skating Championships in the Men's I Interpretive category. In 1997, he competed in the U.S. Adult Figure Skating Championships in Lake Placid, N.Y., in the Silver Men division.
But even there, club members said, they didn't get much more than a greeting from him.
"I really don't know him other than to say he skated on Sundays," club president Jerry Santoferrara said.
However, Rubincan's skating instructor at UD, Pam Welch, described him as a friend.
"He is a talented adult skater who works hard," she wrote in an e-mail. "Yet Butch was a very private person, and it saddens me that he had no one he felt comfortable talking to about what must have been stressful issues."
Rubincan also had parts in area plays, including last summer's "Full House," a series of cabaret performances in the Red Room at the Society Hill Playhouse in Philadelphia.
"Butch was part of a group that performed one of the shows in the cabaret series," said Rich Rubin, whose production company helped put on the show. "Butch was always pleasant, cooperative and easygoing."
Until his arrest, Rubincan had no criminal record in Delaware Superior Court nor Court of Common Pleas. The only record that came up was a civil lawsuit filed against him in 2004 following a vehicle accident.