Dassey Testifies

17-year-old Brendan Dassey took the stand today at his murder trial in Manitowoc County.

Dassey once told investigators that he participated with his uncle, Steven Avery, in the rape and murder of Teresa Halbach but now says that isn't true, and could not explain why he initially admitted to the crimes.

Today, Dassey did say that he helped Avery clean up an unknown substance from the floor of the garage using paint thinner and bleach, but said he never set foot inside Avery's house the night of the crime.