"It's official, today is my last day." That was the word from David Lee Roth seconds into his syndicated radio show this morning (April 21), ending the nearly four-month CBS Radio experiment known as

"It's official, today is my last day." That was the word from David Lee Roth seconds into his syndicated radio show this morning (April 21), ending the nearly four-month CBS Radio experiment known as Roth Radio.

As reported yesterday, CBS Radio and XM Satellite Radio are expected to announce that XM's Opie and Anthony will replace Roth in the seven markets where he succeeded Howard Stern, who segued to Sirius Satellite Radio in January. The duo would host a three-hour show on terrestrial radio, then finish their day with a two-hour unedited version on satellite. XM would air all five hours.

Telling his audience he was informed of his dismissal "in the car on the way to work today," Diamond Dave also said the parting was not amicable: "I was booted, tossed and it's going to cost somebody."

Roth quipped that he and his "legal team of Darth Vader" planned to meet today with CBS officials to "settle like gentleman or start World War 9." Roth said he has retained the same legal team employed by Stern, whom he replaced on Jan. 3.

Roth claims he gave up considerable touring money to take a job with CBS, but also said he wanted to continue in radio, hinting that television or satellite radio are future possibilities. "I have a shout-out to Sirius," Roth said.

"Of course we had crappy ratings," Roth added, adding that he felt the show was finding an audience. "The flow was smoking."

Despite his on-air troubles, Roth was in a good enough mood last night to make a surprise appearance at a retirement party for a bond trader from Credit Suisse Securities at New York's Le Strada restaurant.

Decked out in a shiny blue leather outfit, he joined the house band for four songs, including Van Halen's "Jump" and "Ain't Talkin' Bout Love," the Kinks' "You Really Got Me" and ZZ Top's "Tush," a party guest tells Billboard.com.

Afterward, organizers presented Roth with a $10,000 check to be delivered to the non-profit Songs of Love Foundation, which creates personalized songs for seriously ill children.