Miami ? Michael Beasley said that an offseason stay in a rehabilitation facility was his “lowest hour,” denied that he has a substance abuse problem and apologized Friday to the Miami Heat organization.

The former Kansas State forward would not reveal any specific details of the treatment he received in Houston, other than acknowledging that he became “pretty upset” upon learning his stay would be considerably longer than first planned.

That anger, he said, sparked a wave of troubling messages posted on his now-closed Twitter feed.

“Being locked down for as long as I was gave me a chance to really get my life organized and get back in touch with myself,” Beasley said. “I think over this past year, I’ve got caught up in the NBA life, as most of us do. I think this gave me the perfect opportunity to just sit down and evaluate my life and get the good separated from the bad.”

In a 17-minute session with three reporters, Beasley was asked if has a substance abuse issue. “No, sir,” was the response.

He also does not expect to face further NBA sanction, though acknowledged that he expects any further violations of the league’s substance abuse program would bring a suspension.

Beasley said he was able to spend between 60 and 90 minutes daily working out at the rehab facility. The Heat shuttled many staff members to Houston to work with Beasley daily, including coach Erik Spoelstra, who saw the second-year forward three times.

“In my worst hour, in my lowest hour, to know that my team and my organization backed me up 100 percent, it gives you comfort,” Beasley said. “It gave me confidence in myself that I might have lost and that might not have been there first. It’s just making me feel a whole lot better as a player and a person.”

Beasley returned to South Florida last weekend and resumed workouts with teammates Monday.

Details of Beasley’s rehab saga came to light Aug. 21, when a photo of the No. 2 pick in the 2008 NBA draft was posted to his Twitter account. In the image, Beasley is showing a new tattoo across his shoulders. The photo also showed what appeared to be a small plastic bag on an adjacent table, the contents of which were unclear. Beasley said he did not know the full story behind the now-infamous photo.

“I didn’t know what was in the picture,” Beasley said. “Had I have known, the picture wouldn’t have gone up. I saw the picture. I tried to analyze the picture myself. I couldn’t tell what was in it. To this day, I don’t know what was in it. But it wasn’t mine.”

That was around the time Beasley found out his rehab stay would last another month. Angrily, he posted comments like “Feelin like it’s not worth livin!!!!!!! I’m done” and “I feel like the whole world is against me I can’t win for losin” on Twitter.

“I can definitely say, Twitter, Facebook, MySpace, any social network I’m pretty much done with,” Beasley said. “I put my career and my livelihood in jeopardy. That’s something I worked day in and day out, hour after hour, for basically my whole life for. And to lose it over some Internet social network, garbage network, it’s not smart at all.”