A 71-year-old man who allegedly shot and killed a heating repairman before shooting himself in his home in Londonderry, N.H., on Tuesday had Lewiston roots.

Richard “Dick” Verville died Wednesday, a day after police found him in his home wounded from a self-inflicted gunshot to the head and discovered Dan Rabideau, 59, dead from a gunshot to the head.

Rabideau, an employee of the Manchester, N.H.-based company City Fuel, had arrived at Verville’s home early Tuesday to repair his heating system. Verville allegedly shot him while he was servicing the heating unit.

After police were called for a welfare check and found the grisly scene, Verville was rushed to a Massachusetts hospital in critical condition, unresponsive, and died the next day, according to the office of New Hampshire Attorney General Joseph Foster.

Foster’s office said Verville was “apparently suffering from significant mental health issues.”

Neighbors described Verville as a strange and sometimes threatening man. Some said he would observe them from his home, while others described a letter he hand-delivered to the neighborhood shortly after he arrived in 2012 in which he claimed he was on a terrorist watch list and under surveillance “24 hours a day, seven days a week.”

Verville grew up in Lewiston, attended Saint Dominic Academy, graduated from the University of Maine with a Bachelor of Science degree and did graduate research at Rutgers University in New Jersey, according to Sun Journal archives.

A photo in March 1959 showed Verville as a freshman at a St. Dom’s science fair displaying a new collection of mounted animal skeletons that, according to the caption, included a “cat, pig, bull head, chicken, and of all things, his own Thanksgiving turkey.”

According to a story a year later in February, Verville and his mother were shocked when a specimen ordered for his skeleton collection, a 4-foot alligator from South Carolina, arrived at their door alive instead of dead.

The teen left it outside overnight to kill it. It froze to death.

A 2006 obituary for his mother, Florence, had Verville living in Thailand.

At his New Hampshire home this week, a bomb squad arrived to inspect several objects in the house that “caused the police some concern” after Verville had been taken to the hospital.

His home sported several cameras, some disguised as bird feeders, and motion detectors, along with “No Trespass” signs.

Rabideau’s family said they did not know Verville or whether Rabideau had serviced his home before. Investigators had not released any possible connection between the two men.

“He is a heating tech. He’s not ever in the line of fire. Stuff like this is not supposed to happen,” said Kim Mattucci, 43, Rabideau’s stepdaughter. “No one fears for their lives to give someone heat or hot water.”

Neighbors said they noticed City Fuel vans in Verville’s driveway several times over the past few months.