(Reuters) - Martin Shkreli, the poster boy for prescription drug price increases who was arrested for securities fraud this week, has stepped down from his post as chief executive officer of Turing Pharmaceuticals Inc, the company said on Friday.

Martin Shkreli (C), chief executive officer of Turing Pharmaceuticals and KaloBios Pharmaceuticals Inc, departs the U.S. Federal Court after an arraignment following him being charged in a federal indictment filed in Brooklyn relating to his management of hedge fund MSMB Capital Management and biopharmaceutical company Retrophin Inc. in New York December 17, 2015. REUTERS/Lucas Jackson

Shkreli was replaced by Turing Chairman Ron Tilles, who said in a statement that the company was committed to continuing to make its flagship drug, Daraprim, which is used to treat an infection called toxoplasmosis in AIDS patients.

Shkreli has become a lightning rod for growing outrage over soaring prescription drug prices after the company acquired Daraprim and raised its price to $750 a tablet from $13.50.

Turing is the only manufacturer of Daraprim.

Shkreli has been under investigation for securities fraud related to hedge fund MSMB Capital Management and biopharmaceutical company Retrophin Inc RTRX.O. He was charged in Brooklyn, New York, on Thursday in a federal indictment.

In October 2014, Shkreli was ousted from Retrophin, which he had founded. The drugmaker sued him for $65 million, saying he had breached his duty to the company.

In recent months, Shkreli has made controversial remarks in the press about raising drug prices and taunted detractors, including Democratic presidential candidate Bernie Sanders, on social media outlets.

Shkreli is also CEO of drugmaker KaloBios Pharmaceuticals Inc KBIO.O. KaloBios, which had planned to shut down operations, named him to that post on Nov. 20 after he and a consortium of investors bought about 70 percent of its outstanding shares.

Nasdaq has placed KaloBios’ stock on a trading halt until the company provides more information.

On Thursday night, Shkreli, who was released on a $5 million bond earlier in the day, tweeted “Glad to be home. Thanks for the support.”