Ron Shipp was a close friend of OJ Simpson's but was also a police officer and decided to testify against him in a criminal trial for double homicide. In 1995 OJ Simpson was acquitted of killing his ex wife, Nicole Brown and her friend Ron Goldman. Ron Shipp tells Rebecca Kesby why he wanted to testify.

Photo: O.J. Simpson (C) confers with attorneys Johnnie Cochran (L) and Robert Shapiro (R) during Simpson's murder trial in Los Angeles, CA. (Credit: POOL/AFP/Getty Images)