A homeless man has been arrested in connection with last week's homicide at the Ogden Mill senior apartment complex in Cohoes. Our Megan Cruz has the details.

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COHOES, N.Y. -- "I just don't even know what to do. I'm just so confused over this," said Chris Siakala, who just lost his dad last week.

Police said John Siakala was the victim of a home invasion Friday night at the Ogden Mill senior apartment complex in Cohoes.

Mayor John McDonald, who knew the 67-year-old, said he was shocked by the news.

"It's extremely extraordinary," said Mayor McDonald. "Ogden Mill is one of the finer senior housing complexes in the area. Never really had any major problems that I can recall in the last 12 years I've been mayor."

McDonald said a homeless man has been arrested for this invasion, Mark Richardson, 53, who's had some run-ins with police before for robberies and burglaries. He said Cohoes Police became aware of an intruder in the building around 9:30. He was allegedly knocking on people's doors to rob whoever answered.

When police arrived, they heard a female resident had been struck by Richardson. He fled, but Troy Police's K-9 unit found him in some nearby woods.

"At that time they saw the ID of Mr. Siakala on this person's person," said McDonald. "So they went to check on him."

Chris said his dad had been severely beaten. They transported him to Albany Medical Center, but he later died of his injuries.

Police said they're not sure how Richardson got in the building. The only way in is if someone buzzes you in, unless, residents said, he followed someone else through the open door.

Siakala's son said he wants answers.

"I don't know if there are any cameras in there. People told me there are, others told me there aren't," said Chris. "I want a full investigation and I want to know if there are cameras in there for these elderly people. This could have happened to anybody."

Ruth Shaw lived down the hall from Siakala. She said changes need to happen now.

"Should have a security guard in here for us," she said. "Everybody's afraid now in there."

Richardson's been charged with assault and robbery, but McDonald said this'll likely go to the grand jury for more severe charges since Siakala later died.

Chris said he's glad his dad's alleged assailant has been caught, but said it doesn't make up for losing him so suddenly.

"He just did a lot of stuff for us," he said. "He helped me out quite a few times when he could. He helped out my family, my kids, he helped us for Christmas this year, he was with us for Christmas this year."