More surveillance photos of the masked assailant who chased a 21-year-old woman into her Queens home before mercilessly gunning her down were released Thursday by police, who again asked for the public’s help in tracking down the heartless killer.

Dashanna Donovan, 21, was pronounced dead at the scene after cops found her with a gunshot wound to the head in her apartment on 96th St. near Astoria Blvd. in East Elmhurst around 9:20 p.m. on Sept. 12.

“He had a motive. He knew why. He knew what he was doing,” Donovan’s mother, Helena Hypolite, said of her daughter’s attacker.

“My daughter didn’t deserve this, and no one does. Those who didn’t give life should not have the power to take it away. It is selfish.”

Donovan had just gotten off work at McDonald’s and was sitting outside her h

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