At 91, Soo Ching Chew is tiny, frail and uses a walker — easy prey for a mugger.

She’s been up at night, fearing the return of an attacker who pushed her to the ground and stole her purse Sunday outside the Kensington Market complex where she’s lived for 20 years.

Chew said she’s seen the perpetrator twice since the incident, which left her with a lacerated lip and missing her gold watch, a wallet containing $300 in grocery money, and keys.

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“He has the key to open my door, so I’m scared,” she told the Star in broken English from her daughter’s apartment in the same complex on Thursday.

On Tuesday afternoon, she said she saw the man on Oxford St. walking his low-rider bike, which he fled on after attacking her. Again on Wednesday, around 10 a.m., she spotted him strolling along the street, but when he caught sight of her, he sped off towards College St.

Since the robbery, Chew has received two “suspicious” phone calls from an English-speaking male demanding to know who she is.

“This guy keeps coming back and we think it’s maybe to intimidate her,” said family friend David Chu.

Police have requested help locating a suspect. They have also released a video depicting Chew making her way with a walker through a slowly opening door before a man rushes up behind her, shoves her and snatches her purse.

Chew recalls the suspect as young and brown-skinned. That description differs from the police’s description of a white male, aged 20 to 25, with short black hair, wearing a black T-shirt, blue shorts and a white backpack with a black material or pattern.

The man has put Chew on edge, because light bulbs in a set of lamps illuminating her complex’s entrance have gone missing and have yet to be replaced, said Chu.

He hopes the culprit will be caught soon so that Chew can stop fretting.

“It’s important to us and it’s unacceptable that we have one person operating and preying on seniors,” he said. “She’s never had any problems here before, not a whisper, but now she is afraid for her life.”