Jessica Heeringa Abduction Suspect Sketch Photo: Police Release Image Of Possible Kindnapper

Investigators have released a sketch of a suspect wanted for the abduction of a 25-year-old woman last seen working a night shift at a Michigan gas station.

Jessica Heeringa, the mother of a 3-year-old boy, disappeared around 11:15 p.m. April 26 from the Sternberg Rd. Exxon location in Norton Shores.

Since Heeringa went missing, authorities have collected hundreds of tips, established a $15,000 reward, released surveillance footage and distributed a suspect image.

Shelly Heeringa, Jessica's mother, is hopeful that the artist rendering will bring her daughter back, she told WZZM.

"I actually think it's a pretty good sketch and that there's some features on it that maybe don't look exactly like him, but his features--and I'm hoping the features will stand out--like the hair, the close-set eyes," she said.

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According to the Norton Shores Police Department: "[The suspect] is described as a white male, age 30-40, about 6 feet tall, with center-parted light brown wavy hair. This suspect is believed to have been driving the silver mini van. "

Christian VanAntwerpen, who works nearby and believes he possibly witnessed Heeringa speaking with her alleged abductor, didn't find the interaction overly suspicious until he learned she was missing.

"It just seemed to me that this was just another guy hitting on her, or whatever, because she was an attractive girl," VanAntwerpen told ABC News.

Anyone with information on Heeringa's disappearance is asked to call Silent Observer at 231-72-CRIME (231-722-7463).