Garrison Keillor: The Man on the Radio in the Red Shoes (8pm, UNC-TV) - A year in the life of Garrison Keillor focuses on his "Prairie Home Companion" radio program, as Keillor and his crew travel from town to town putting on their show.

Pitchmen (11am, Discovery) - In honor of show star Billy Mays, who died suddenly this past Sunday, Discovery is airing a "Pitchmen" marathon today starting at 11am. A new episode, the first season finale, will air at 10pm (Billy and Anthony "Sully" Sullivan help "Survivor: Africa" winner Ethan Zohn develop an alternative cereal bowl). Discovery will air special tribute promos throughout the 12-hour marathon, including some never-before-seen footage of Mays.

The Philanthropist (10pm, NBC) - Teddy travels to Myanmar on business and encounters a young girl who needs a kidney transplant. Her father is a match, but is being held in forced labor camp.

Television personality Billy Mays, famous for his shouting infomercials and his television show "The Pitchmen" on the Discovery Channel, did not die from a bump on the head, as many had speculated.

Mays had suffered a bump on the head when his plane had a rough landing in Miami Saturday. But autopsy results released today say the likely cause of death was a pulmonary embolism. The autopsy also indicated that Mays had heart disease.

Click below for video of Billy Mays.