NEW YORK (CBSNewYork) – A man is in custody after police say he shot and killed a woman at a construction site in the Bronx on Wednesday.

The woman was working on City Island when a man on a bicycle shot her multiple times.

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Witnesses captured video of a man in handcuffs, believed to be responsible for gunning down 52-year-old Lizbeth Mass, who is known in the community for keeping traffic moving around a City Island Avenue construction site.

“She’s the flagger for this construction company, so as long as they’ve been here, she’s been here,” one man told CBS2’s Jenna DeAngelis. “Very outgoing. She spoke to everyone.”

Marta Martinez got used to seeing her smiling face every day. She’s in disbelief Mass is gone.

“She was always very pleasant, very chipper, just a nice person,” Martinez said. “I just can’t imagine why anyone would do something like that to someone as nice.”

Around 12:30 p.m., police sources say Mass was shot multiple times by the 66-year-old who tried to get away on his bike.

That’s when a 58-year-old man, who was also working at the construction site, allegedly got in his car to chase after the suspect, striking him.

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It’s apparently not the suspect’s first time visiting the site.

“My crew that’s working on my property expressed to me that he would come every day to bring her sandwiches,” one man said. “It’s just tragic.”

The sound of mid-day gunshots isn’t uncommon in the area due to a nearby police range, but an actual shooting is a shock for neighbor and local business owner Rod Rodriguez.

We’re told this is the first murder on City Island in 25 years.

“Very unusual for City Island. I’ve been here 17 years,” Rodriguez said. “Never in my wildest dreams did I think something like this could happen.”

Police are still investigating a motive for the shooting.

A question some had is, why after the tragedy construction crews were still working there.

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DeAngelis asked and was told they were working on a water main replacement and had to make sure neighbors had their water back on.

Jenna DeAngelis