OKLAHOMA CITY (AP) — The Latest on a criminal investigation of state Sen. Ralph Shortey, a Republican from Oklahoma City who is facing felony child prostitution charges alleging he solicited sex from a 17-year-old boy (all times local):

9:50 p.m.

An attorney for a Republican state senator from Oklahoma City facing felony child prostitution charges says his client plans to resign his seat by Wednesday.

Attorney Ed Blau said Monday he's been hired to represent Sen. Ralph Shortey, who is facing three felony counts after police say he solicited sex from a 17-year-old boy.

Blau said he'd recently been retained by Shortey and that it was premature to comment on the charges until he had more time to discuss the case with his client. He said he expects a not-guilty plea will be entered on Shortey's behalf when he makes his initial appearance in court later this week.

The Senate voted unanimously last week on a resolution stripping Shortey of most of his legislative privileges.

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4:50 p.m.

The U.S. Secret Service has confirmed it is joining the investigation of a Republican state senator from Oklahoma City who is facing felony child prostitution charges.

The Secret Service's special agent in charge of the Oklahoma City office, Ken Valentine, confirmed Monday that investigators from his office are assisting in the investigation of state Sen. Ralph Shortey at the request of the Moore Police Department.

Valentine says the agency has access to some of the latest technology for investigating crimes that involve the use of smartphones and computers.

Moore police have said they uncovered a series of electronic messages between Shortey and a 17-year-old boy using the messaging application Kik.

State prosecutors charged Shortey last week with three felony counts related to child prostitution.

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2:30 p.m.

Oklahoma state retirement officials say a state senator from Oklahoma City who is facing felony child prostitution charges will still be eligible to collect his state retirement, even if he is convicted of the charges.

The executive director of the Oklahoma Public Employees Retirement System, Joseph Fox, confirmed Monday that Republican Sen. Ralph Shortey became vested in the state's retirement system last year after serving six years in the Oklahoma Senate.

Fox said state law allows for the forfeiture of retirement benefits only if the felony conviction is for bribery, corruption, forgery, perjury or related to campaign contributions or the duties of office.

If Shortey contributed the maximum amount to his retirement, he would be eligible to collect $9,216 annually after he turns 60.

Shortey hasn't responded to requests for comment.

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1:30 p.m.

The FBI in Oklahoma City has confirmed it is investigating a Republican state senator who is facing felony child prostitution charges after police say he solicited sex from a 17-year-old boy.

FBI spokeswoman Jessica Rice confirmed Monday that her agency served a search warrant Friday at the Oklahoma City home of Sen. Ralph Shortey. Rice said she could not provide any more details because of a "sensitive ongoing investigation."

No federal charges have been filed against Shortey.

State prosecutors charged Shortey last week with engaging in child prostitution, transporting a minor for prostitution and engaging in prostitution within 1,000 feet of a church. He was released on a $100,000 bond.

Court records don't show whether Shortey has retained an attorney, and he hasn't responded to texts and voicemails seeking comment.