EVERETT, Wash. – An escort has been arrested after allegedly shooting a client in the head because she thought he was bad at performing oral sex.

The Everett Herald reports Marissa Wallen, 21 admitted the man had paid her for sex on Oct. 21 in Washington state. The two went to the man's apartment

In a statement given to police, Wallen said she shot the man twice in the back of the head “because he was performing (a sex act) wrong,”

After shooting the man, Wallen left him to die in his apartment where his body was found three days later.

Before leaving the apartment, Wallen stole the man's wallet and went on a $12,000 spending spree.

Police were called on Oct. 24 when the man's employer noted he had failed to log-in to for his work-at-home job. An officer found the man inside the apartment, slumped up against a wall.

A security system at the apartment complex showed Wallen running from the home.

The police report described Wallen as "emotionless and calculating" throughout her interview.

Wallen reportedly asked police to call one of her other clients to help post her $1 million bail.