He appeared in the First, Second seasons and a major antagonist in the Third Season episode "Shattered".
He was portrayed by Kwesi Ameyaw.
Clark Kent and Chloe Sullivan visited the Mansion to interview Lex about Level Three and other secrets that LuthorCorp were hiding. Before he could answer the question, Darius entered the room to tell Lex his father was on the phone for him.
When Dr. Helen Bryce moved into the Mansion, she took a tour to investigate the rooms. She came upon a locked room on the third story in the east wing of the mansion when Darius appeared behind her.
She said she was looking for the solarium and Darius offered to escort her there. Helen then asked about the locked room but Darius stated it was off-limits and only Lex had the key to it.
After Lex found Morgan Edge in Metropolis, he convinced him to confess on tape that he conspired with Lionel to kill Lex's grandparents. While Lex reviewed the tape at the manor, his security guard Darius informed him that his father has called again.
Lex avoids the call and hid the tape in the safe just before an assassin bursts in and killed Darius.
After a brief struggle Lex leaps out a window, badly twisting his ankle and sought refuge at the Kent Farm. Clark found Lex and offered to go to the mansion to retrieve the evidence in the safe.
When Clark arrives there, he found the safe empty and the window repaired: a small shard of glass was the only evidence of the break in.
When Clark returned to the farm, he reported what he found to Lex who was convinced he was being set up and insists that he has to go find Edge to prove he's not crazy. They went to the warehouse where Morgan was but found it had been transformed into a sewing factory.
Clark and Lex returned to the mansion to search for clues, and they find Darius alive and well. When his psychiatrist, Dr. Claire Foster, arrives, Lex consequently threatened to kill both of them for their betrayal.
Eventually, Darius' double-cross was uncovered by Clark, who used his super strength on the guard in order to get the truth. He admits he's been spiking Lex's scotch. He forces Darius to call his contact and tell him to meet him at the stables with a bag of money.