Steve, who signed up as the 26-year-old's publicist in May 2011, dropped off the position, reported Ace Showbiz.
Steve wouldn't detail why he parted ways with the "Liz & Dick" star, but said, "I really feel very firmly that it's private and I don't want to say anything."
Sources said it had nothing to do with the actress. Instead, his decision was allegedly made due to the tension with her father Michael Lohan as he hinted, "Michael wishes he were that important."
Lindsay previously had Leslie Sloane as her publicist before they called it quits in 2010. Steve, meanwhile, is currently also representing Hole's lead vocalist Courtney Love.
Steve's resignation came after Michael's failed attempt to get Lindsay Lohan to enter rehab.
Michael later said that he got the blessing from her team to stage the intervention, but Steve said in a statement that her management team had nothing to do with Michael's plans.
Michael then responded by calling Steve a "liar" in a text message.
