from www.nydailynews.com – A man accused of killing a 75-year-old is facing new charges – keeping a teenage sex slave.

Andrew Lagerquist, originally from De Moines, Iowa, allegedly made the 16-year-old girl call him “Daddy” and fed her meth addiction for three months in 2009, according to Seattle authorities.

“She was, for all intents and purposes, his slave,” prosecutor Sean O’Donnell wrote in court documents, the Seattle Post-Intelligencer reports.

The 25-year-old is being charged with promoting sexual abuse of a minor and felony harassment.

These are in addition to the second-degree murder charge he’s already facing for allegedly stabbing the elderly man to death in Auburn, Washington last month.

The girl, whose name has not been released because she is a minor, first came to the attention of police in October 2009.

She told authorities she was trapped by Lagerquist throughout the summer before running away to hide with a friend. Although the teen admitted to having a sexual relationship with the man when she was 15, it soon became a twisted affair of drugs and violence.

She claims Lagerquist trained her to be a hooker, then routinely beat her when he suspected she was hiding her earnings. He kept control of her by feeding her “unlimited amounts of methamphetamine,” court documents said.

from www.seattlepi.com – He made the teenager call him “Daddy.”

And he told the 16-year-old girl that she was his property.

Prosecutors say for three months last year, Andrew Cory Lagerquist, who is also accused of murder in a separate matter, threatened the 16-year-old and fed her methamphetamine habit, then beat her when she didn’t return with money after working as a prostitute.

“On one occasion he imprisoned her because she tried to escape him,” prosecutor Sean P. O’Donnell wrote in court documents. “She was, for all intents and purposes, his slave.”

Lagerquist, 25, of Des Moines, faces charges of promoting sexual abuse of a minor and felony harassment. Prosecutors are seeking bail of $750,000.

He is already being held on $1 million for a charge of second-degree murder. He is accused in that case of stabbing a 75-year-old man to death in Auburn.

That victim died from six stab wounds in what a prosecutor described as a “brutal and senseless murder of an elderly man who posed no threat.”

Kent police began investigating the prostitution case in August 2009. Officers had heard that a young girl had been forced into prostitution and was working on the west hill of Kent and in Des Moines and Tukwila.

In October 2009, police found her after she had escaped to a friend and contacted authorities.

She told police that she had met Lagerquist when she was 15. They had sex early in their relationship, then he “fueled her drug addiction with unlimited amounts of methamphetamine,” Kent police Detective Brendan Wales wrote in court documents.

Documents in the murder case say Lagerquist is also a meth user and smokes “sherm,” or PCP.

Lagerquist soon put the girl to work, telling her how to be a prostitute. He told her what to charge her “johns” and to return the money to him. And he set her up in a Tukwila motel room.

He strip-searched her when he thought she was hiding her earnings, court documents say.

When the girl refused to “walk the highway” or came back with no money, Lagerquist bit, punched and kicked her, calling her “bitch, slut and whore,” court documents say.

She was left with bruises. She also thought Lagerquist might have broken her ribs.

Prosecutors say Lagerquist has a long criminal record, including convictions for robbery, car theft and unlawful firearms possession.