Lansing - A man was found dead Tuesday afternoon in the Red Cedar River in Lansing, near Kalamazoo and Clippert Streets.

Police were investigating the incident as "a suspicious death," and an autopsy performed Wednesday concluded with inconclusive results.

Roberto Martinez, friend of the man he called "Ran Dan," returned after a brief trip Tuesday to the location they were living at - among the trees west of Kalamazoo Street and on the shore of the Red Cedar River - and noticed something wasn't right.

Police had taped off the area and were investigating a body found in the water next to their campsite.

Martinez said he and a group of men had been "kicking back" at the campsite, where "Ran Dan" had a tent, and "were all drinking."

Multiple police and rescue teams swarmed the area after Lansing Police received an anonymous call at about 2:30 p.m. Tuesday, claiming a body had been spotted in the river.

"Officers began checking locations from Frandor south, and we found what appears to be a white male somewhere between 40 and 55 in the river, and who appears to be the victim of a drowning," Lansing police Lt. Bruce Ferguson said.

A police dive team and Criminal Scene Investigators arrived after uniformed officers finished questioning individuals at the scene.

The dive team then removed the body from the water, which was about 10-15 feet deep and about 60 degrees where the body was found, after CSI members stood by and photographed the scene.

Lansing police Sgt. Joe Brown, the dive team supervisor, explained the dive team specialized in assisting with these types of cases.

"It's obviously a different environment, and we're trained to recover objects, items and bodies from the water, and we have the equipment and training expertise to process crime scenes that are under water," Brown said.

With the water moving at about two knots and zero visibility, Brown said the dive team had a tough time retracting the body, though when the body was removed, Brown said "no signs of foul play were visible."

Ingham County Medical Examiner Bon Hiscoe also briefly inspected it at the scene, before it was taken away in an ambulance.

"There's no sign of trauma or that he's been attacked," Hiscoe said.

Martinez couldn't believe what was happening, but knew his friend was living a rough life.

"I've known him for a while, almost 30 years. We grew up together," Martinez said.

"He was just tired - tired of living. I didn't know he was going to do this for real, otherwise I wouldn't have took off. Shoot."