Cops have arrested an 18-year-old youth accused of killing a man pushing a walker and wounding a woman, both with stray bullets, four months ago as he opened fire at a group on a Bronx street, officials said Thursday.

NYPD detectives grabbed Brandon Sullivan on Wednesday afternoon after he was identified as the person responsible for the May 18 shooting on E. 188th St. in Fordham that took the life of 57-year-old Kevin Jennings.

Sullivan was wearing a hooded camouflage-colored sweatshirt around 6:45 p.m. that evening when he opened fire on a group of about 10 men near Marion Ave., cops said.

He didn’t hit anyone he was aiming at, but shot Jennings, an innocent bystander, in the head with a stray shot. A 34-year-old woman standing nearby, who police described as another innocent bysta

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