"I was having a bad day," illegal immigrant Diego Pillco from Ecuador, allegedly told cops. "I didn't mean to kill her. But I did kill her."  Shelly was murdered by the 19-year-old construction worker with whom she argued about building noise in the apartment under her office in New York City.

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The Ecuadoran immigrant confessed he threw a hammer at the 40-year-old married mom and - fearing that he might be deported - followed her upstairs when she threatened to call police, he told cops.

When they reached her door, Pillco said Shelly slapped him and he knocked her out with a punch. Then, unable to detect a heartbeat, Pillco said he dragged her to the bathroom to stage a suicide.

The construction worker accused of killing indie actress Adrienne Shelly tied a sheet around her neck, dragged the unconscious woman to a bathroom - and strung her up while she was still breathing, sources reported.