Also Michael McKean.
Bump bump? Shouldn’t it be doink doink? 
Do you mean Oz, or is there something else too?
Which of these hit movies have no major actor connection to Law and Order?
A) Ocean’s Twelve
B) The Blair Witch Project
C) Dogma
D) Titanic
They all do.
Ocean’s Twelve: Julia Roberts guest starred while she was dating Benjamin Bratt
Blair Witch: Mike guest starred as the father of a missing baby who claimed that his divorced wife had custody so she must’ve killed it.
Dogma: Janeane Garofalo guest starred in the 3 part LA episode - she was the murdering director’s assistant.
Titanic: Kate Winslet’s mom (can’t remember her name) guest starred in the episode where the geneticist was murdered and they thought it was an animal rights group. But it was really her - she killed her husband for having an affair
Here’s an interesting one I just found out the other day :
What actual children’s show actor got killed off in the first five minutes of the original L&O show?
Five actors from The Practice did one-or-more guest shots, with each playing a criminal or suspected criminal:
Michael Badalucco - played suspected killer
Steve Harris - played extortionist, suspected arsonist
Camryn Manheim - played suspect child abuser (and in another appearance played a lawyer, the only Practice actor to do so)
Jessica Capshaw - played junkie/petty criminal sent to halfway house
Lisa Gay Hamilton - played murderer
Whoops, the petty criminal/junkie was Kelli Williams, not Jessica Capshaw.
I wish I could have answered one for the original series (and a hard one, at that), but you’re talking about Vincent D’Onofrio, aren’t you?
Actually, there’s at least one more Oz & L&O crossover actor, although he’s not a regular, per se: Mike Doyle. I don’t know his character’s name on Oz, but he plays a CSU/tech (O’Halloran?) on SVU. He’s a repeat character like the MEs but not a main character.
This bit of trivia I know because I went to school with him (& took acting classes with him) when we were in 6th grade - 9th grade. I moved to Indiana after that.
Would that be Steve from Blue’s Clues?
I don’t know about the other one’s you listed, but the Dogma answer was not Janeane Garofalo… I don’t believe she was in the movie. However, I do remember seeing a L&O episode with Kevin Smith in it…
She was one of Linda Fiorentino’s co-workers at the abortion clinic.
I stand corrected! You are right, I had forgotten about that. However I still think Kevin Smith makes a better answer. 
You got it!
He showed him the cigar burns on his arm from the last time he was arrested. He didn’t confess then, so why wouldn’t he confess now unless Logan really did threaten to blow his brains out?
Not exactly a “regular” cast member, but Elliott’s wife on SVU was a criminal on the original L&O. She played a punk rock type girl who killed a cop, then converted to Christianity and didn’t contest her death sentence. Ah, Isabel Gillies is her name.
Cheri Oteri?
Which L&O regular was a guest on Homicide’s captivating “subway” episode?
It was “Unusual Suspects”
The episode with Jesse L. Martin was “The Unnatural” and B.D. Wong was in “Hell Money”
Vincent D’Onofrio as the man who was crushed by the train.
What job did DA Adam Schiff take when he left the DA’s office?