Dallas Mavericks owner Mark Cuban was investigated in a 2011 alleged sexual assault of a woman in a downtown Portland nightclub but wasn't charged because of insufficient evidence, according to a report from Willamette Week Tuesday.

The woman, now in her 30s, told Portland police investigators that she saw Cuban at the Barrel Room along Northwest Third Avenue in April 2011, posed for a picture with him on the advice of a friend who went to the bar with her and claimed Cuban put his hand down the back of her jeans and penetrated her with his finger while the picture was being taken, Willamette Week reported.

Cuban has denied the allegation. The report comes two weeks after Sports Illustrated detailed years of sexual harassment and misconduct allegations within the Dallas Mavericks' organization. Cuban is also one of the stars on ABC show "Shark Tank".

Cuban appeared drunk at the time, the woman told police in 2011. She said she told her friend and boyfriend the same night about the alleged incident. She said she stopped her boyfriend from going back into the bar and confronting Cuban because he also was drunk, the Willamette Week report said.

Barrel Room bartenders and security guards told police they didn't see the alleged sexual abuse. The woman reported the alleged assault to police more than a week later and was interviewed by police more than two weeks after the alleged incident.

A police investigator wrote in his report that two pictures with Cuban and the woman show

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the NBA team owner with his shoulder nearest to the woman lowered and his arm appearing to be reaching down. One of the pictures shows Cuban's arm behind the woman and it appearing as if Cuban is reaching toward her buttocks, Willamette Week reported.

The woman's expression in the photo appears to be one of surprise, the detective noted.

The Multnomah County District Attorney's Office determined there was no corroborative evidence to support the woman's allegation and warrant pursuing criminal charges.

-- Everton Bailey Jr.

ebailey@oregonian.com

503-221-8343; @EvertonBailey