Tonight, on Hannity & Colmes!

• A new videotape has been released that shows Columbine killers Dylan Klebold (search) and Eric Harris (search) doing target practice six weeks before they carried out the horrific high school massacre. They can be heard laughing and making cavalier comments about what it would be like if the bowling pins were human heads or bodies.

Can the video unveil some clues about one of the worst school shootings in U.S. history? Or, is it just senseless footage that will cause pain to the victim’s families and loved ones? Criminologist Jeffrey Ian Ross will answer our questions.

• Today sniper suspect John Allen Muhammad (search) changed his mind and stopped acting as his own lawyer at his trial after only one day of cross-examining witnesses. Jonathan Shapiro (search) and Peter Greenspun (search), who had been advising him on standby since his decision Monday, returned to their former roles as his defense lawyers.

What legal ramifications will these bizarre actions carry? Criminal defense attorney Melinda McAllister and FNC legal analyst Lis Wiehl weigh in.                     

• And Laura Ingraham, author of Shut Up and Sing, will join us.

All these stories and more!

We've got a great show for you tonight! Don't miss Hannity & Colmes LIVE this evening at 9 p.m. ET!

--The Associated Press contributed to this report

-All guests and topics subject to change