This man is a person of interest in the Oct. 11 home invasion that left 91-year-old Waldiman Thompson dead, according to police. View Full Caption NYPD

BEDFORD-STUYVESANT — Police have released a photo of one of the men suspected of killing a 91-year-old man and injuring his 100-year-old wife during a home invasion last week.

The suspect — a man spotted on surveillance footage walking away from the scene carrying a locked box — is wanted for questioning in the death of Waldiman Thompson in his Decatur Avenue home on Oct. 11, the NYPD said. He was described as wearing dark clothes and a carrying a backpack.

The NYPD has quadrupled the reward for information leading to the arrest and convictions of the men involved in the robbery, increasing it to $10,000 from an earlier sum of $2,500, police said.

Authorities said two men followed the wife, Ethlin Thompson, into her ground-floor apartment just before 3:30 p.m. on Oct. 11 and tied her and her husband up as they ransacked the apartment.

The husband went into cardiac arrest during the home invasion, and Ethlin Thompson was forced to untie herself and run into the street calling for help, telling witnesses “I think my husband is dead in there,” according to police and neighbors.

First responders attempted to revive the man, at one point giving him sustained chest compressions as his wife sat dazed on the stoop, but he was pronounced dead that afternoon at Interfaith Medical Center, officials said.

Ethlin Thompson, who was described by family and neighbors as a deeply religious woman and the family matriarch, was taken to Kings County Hospital, where she was held for observation for more than 24 hours, police said.

The couple was known by neighbors for sitting on their front patio and playing the radio, as well as tending to their flock of five parakeets making time to greet passersby.

"They were quiet people, you know?” said Cynthia Clarke, who would often see the pair doing laundry together at a laundromat around the corner. “They would come in here, do their chores together, they were nice people.”

Anyone with information in regards to this incident is asked to call the NYPD's Crime Stoppers Hotline at 800-577-TIPS. The public can also submit tips on the website.