Adrian J. Gilliam Jr. Sold Gun that Killed Steve McNair

The guy who allegedly sold the gun that killed Steve McNair -- a man named Adrian J. Gilliam Jr. (left) -- has been arrested by ATF agents in Nashville, Tenn.

McNair's mistress, Sahel Kazemi, bought the gun on July 2 -- two days before she murdered Steve and then killed herself.

Prosecutors are expected to announce the charges against Gilliam this afternoon.

UPDATE: Gilliam has been charged with illegally possessing a firearm. A big no-no for the convicted felon.

Gilliam was convicted of murder and attempted armed robbery in 1993.

Don Mattingly's Son Taylor Mattingly

The son of former New York Yankees star Don Mattingly was arrested in Evansville, Indiana yesterday after cops say he shoved his poor mother to the ground -- then spit in her face.

According to an affidavit acquired by The Evansville Courier & Press, 24-year-old Taylor Mattingly told cops he jumped the fence at his mom's house to confront her over an insulting text message she sent to him.

Taylor also admitted he "snapped" and flipped over a patio table, broke a door and window and tossed furniture into the walls of their pool house.

Mattingly was booked in the county jail and faces preliminary charges of battery by bodily waste, battery and criminal mischief. He was released on $250 cash bond.

Lucky for him, the jail's camera was broken at the time -- so no mugshot for the hall of shame.

Jeffrey Donovan - Burn Notice Star Arrested

MIAMI BEACH, Fla. — Miami Beach police say they arrested "Burn Notice" star Jeffrey Donovan on suspicion of drunken driving.

The arrest report says an officer pulled Donovan over on July 12 after noticing that he swerved his car to avoid hitting the police car from behind. When the officer approached Donovan, he reported that the actor's eyes appeared bloodshot and watery.

The actor of the popular USA Network series was arrested after failing a field sobriety test. The arrest report says Donovan refused to take a breathalyzer test.

The 41-year-old actor, who worked alongside actress Angelina Jolie in the 2008 film, "Changeling," was released several hours later on $1,000 bail.

His publicist declined to comment, and a phone message left with a network spokeswoman was not immediately returned.

Gary Coleman's Wife Shannon Price Arrested

Gary Coleman and his wife aren't seeing eye to eye.

The ex-child star's bride - who is 5-feet-5 - was busted after trashing her 4-foot-8 husband's bedroom, police said.

She allegedly greeted cops in her Utah driveway with a profane tirade.

"F--- you and f--- him!" Shannon Price screamed before her arrest Wednesday night.

"You deserve this after how you treated me!" she shouted at Coleman as the "Diff'rent Strokes" star stood amidst toppled furniture, scattered DVDs and strewn clothes.

Price, 23, spent two hours in a county lockup before being released on $1,205 bond.

Police in Santaquin, Utah, were called to the home after Price - who married Coleman in August 2007 - locked her husband out of the house.

Coleman, 41, was not injured, although a police report said "his bedroom was destroyed."

The arrest was the latest marital mayhem for the pair, who met on the set of the comedy film "Church Ball" just five months before exchanging vows.

Last year, the couple reconciled after an appearance on the syndicated "Divorce Court," where Price described Coleman as distant and depressed.

Price was charged with misdemeanor domestic violence and disorderly conduct.

Coleman has had his own legal problems. He pleaded no contest last year to charges he rammed a fan with his truck outside a bowling alley.