Police in Indianapolis say a man convicted of child abuse in 2012 for forcing three grandsons to hike the Grand Canyon has been shot to death.

They say 50-year-old Christopher Carlson of Indianapolis was found shot multiple times Friday in an alley on the city's north side. Police say they have no suspects.

Two small children who investigators believe to be Carlson's children were unharmed and being cared for by a police Victim Assistance Unit.

Sgt. Christopher Wilburn said Sunday that Carlson's relatives stated he was the same man convicted of child abuse for forcing his grandsons — then ages 8, 9 and 12 — to hike 19 miles in the Grand Canyon in August 2011. A federal judge ordered him to serve 27 months in prison.