Transcript for Man Killed on Walk to Highlight Dead Son's Bullying Struggle

This data new heart break -- what I'm. -- I hear words -- -- change change brought on by the bond between father and son that pushed Joseph bell to walk for change. No spring chicken anymore but here it was spring when his truck started at hearts his cell phone. And the memory of his fifteen year old son -- gay and bullied because of it it's not -- and took his life because of the bullying. Joseph made stops along the way speaking out about his son he posted this video blog on Tuesday. Just days before he was killed. I'm out here in the plains of Colorado. Headed toward seven -- -- -- -- -- -- Cold but not giving up Reuters. Almost hear that a couple pretty cold days a father and son and a tragic message. Thank you for everything that. And I'll keep on -- that perhaps now shines even more brightly.

This transcript has been automatically generated and may not be 100% accurate.