COLUMBIA COUNTY, FL -- 47-year-old Mary Boswell and her 29-year-old son Larry Whitworth have been missing since their roommate's body was discovered in a pond near their home in Columbia County. Boswell is now in custody.

State troopers in Roane County, Tennessee spotted the mother and son driving the victim's truck, and gave chase on foot when the two jumped out of the truck on the side of the highway.

Five agencies and tracking dogs took part in the search on the ground and in the air.

Mary Boswell was caught by police while her son barricaded himself in a trailer.

Police fired five rounds of tear gas into the trailer then went inside, but Whitworth had fled.

Officers were still searching the area for him as of late Thursday night.

A family friend reported 59-year-old James Gifford missing Wednesday morning. His wallet was found on the side of a road in Hamilton County.

Officers in Columbia County went to his home and no one answered the door. A neighbor called police a few hours later after seeing Gifford's body in a nearby pond.