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Police released this sketch of a "person of interest" in the death of 14-year-old April Millsap in Armada, Mich.

This photo provided by the Millsap family via Michigan State Police on Sunday, July 27, 2014 shows April Millsap, 14, of Armada, Mich., whose body was found in a drainage ditch near a trail in southeastern Michigan on July 24. Police say she was slain and are circulating a sketch of a man considered a "person of interest" in the homicide. (AP Photo/Millsap family photo via Michigan State Police)

UPDATE: Police: Family, boyfriend not suspects in April Millsap's death

ARMADA, MI (AP) - Police in southeastern Michigan released a sketch Sunday of a tall white man they call a "person of interest" in the killing of a 14-year-old girl who disappeared while walking her dog and whose body was found in a drainage ditch.

State and Armada police held a news conference asking for public help in tracking down the killer of April Millsap. Two joggers found her body Thursday night off the Macomb Orchard Trail, about 35 miles northeast of Detroit.

"There's no such thing as a tip that's not worthwhile," said Armada police Chief Howard Smith. "We're especially interested in any information from anyone who was on the trail between 6:20 and 8:20 p.m. Even the smallest bit of information could be helpful."

One possible clue, Smith said, is a text that April's boyfriend received from her phone the night she was killed.

"Omg. ... I think I'm being kidnapped," the text said.

The man in the sketch was seen in the area around the time that April disappeared, police said.

"If it looks like anyone you might know or see, please call us," Smith said.

Investigators have consulted with FBI experts, who say potential suspects may show an excessive interest in the case or have unexplained absences from their regular activities, police said.

Two motor vehicles may have some connection to the disappearance, police said. They include a gray, painter's-type van with many dents in it, with two while males inside, and a small-capacity blue and white motorcycle with a young male rider.

An autopsy confirmed that April was killed, but Smith declined comment on how she died, other than that she was neither shot nor stabbed.

April just graduated from Armada Middle School and was to start high school in the fall.

About 300 people attended a vigil for April on Saturday night outside St. Mary Mystical Rose Church in Armada.

"We're at a loss," her grandfather, Dennis Levans, told the Detroit Free Press by phone from Coconut Creek, Florida. "She was just a beautiful young lady."