Kotarac was last seen Wednesday night at about 10:15 p.m., "trying to force her way inside (the home) as she was involved in a dating relationship with the resident," police said. "The resident left the house undetected to avoid a confrontation and stayed the night elsewhere."
Authorities did not identify the boyfriend or say why Kotarac was attempting to get inside his home.
Kotarac did not arrive for work on Thursday, and her assistant and the boyfriend searched for her at his home. Her car and belongings were there, but there was no indication she had gotten inside, police said. The boyfriend and her medical staff reported her missing.
"Her purse was there, with her phone, all her money, all her credit cards, all that stuff," neighbor Terri Terrazas told CNN affiliate KBAK-TV.
Thursday night, the boyfriend stayed at the home before leaving for Europe, police told KBAK