Prosecutors believe Smith killed Christensen to silence her just after Smith's friend, Paul Clifford Ashton, shot and killed Brandie Sue Dawn Jerden, 27, and shot and wounded James Fiske.
But Fiske testified at Monday that he saw Smith with a gun before the shooting started.
Testifying about events leading up to the slayings, Fiske said that at about 3 a.m. on Dec. 11, 2010, he was at the apartment, located at 575 S. Main Street, with the two women, Smith and Ashton. At some point he saw Jerden "smack" Ashton.
Fiske testified that he saw Smith pull out a gun. Fiske said he heard a shot, then he stumbled out of the apartment, bleeding from a gunshot wound.
Prosecutors, however, believe Ashton fired the gun. And during Fiske's testimony, defense attorneys pointed out that Ashton had already pleaded guilty to fatally shooting Jerden.The Spectrum of St. George reported that in an interrogation tape played in court, Smith told a police detective that he drew his own gun when Ashton pulled his gun and shot Jerden.
Smith also told police that he used a "small pipe" to beat Christensen before cutting her throat, The Spectrum reported.