The defense in the Jodi Arias murder trial on Wednesday tried to portray the victim, Travis Alexander, as a liar and cheat who deceived all his girlfriends.
Arias is accused of killing Alexander at his Mesa home in a jealous rage in 2008.
Her defense claims it was self-defense.
[Watch live streaming video of the trial on cbs5az.com]
The defense continues its case at 10:30 a.m. Thursday in Maricopa County Superior Court.
The first witness on the stand Wednesday was an ex-girlfriend of Alexander.
She testified that he did cheat on her with Arias.
"I felt that if we were to be in an exclusive relationship, neither he nor I should be testing, calling members of the opposite sex as often as he did," she testified.
"Did you ever have suspicions he might be cheating?" a defense attorney asked.
"Yes," she said.
Alexander was stabbed and slashed 27 times, shot in the forehead and had his throat slit.
If convicted, Arias could face the death penalty.
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