Levi Johnston, 20, who fathered a child with Bristol Palin, the daughter of the former Alaska governor Sarah Palin, is writing a tell-all book about the Palin family, People reports.
"Deer in the Headlights: My Life in Sarah Palin's Crosshairs" will be released by Touchstone Publishing in the fall.
"I want to tell the truth about my close relationship with the Palins," Johnston said in a statement to People magazine. "My sense of Sarah and my perplexing fall from grace - how I feel and what I've learned... I'm doing this for me, for my boy Tripp and for the country."
Johnston has publicly spoken out against Sarah Palin in the past, speculating on her marriage difficulties and later apologized to the politician-turned-reality star and her husband Todd.
He also said that abstinence is "not realistic" while Bristol Palin, the mother of their 2-year-old son Tripp, is a public speaker on abstinence and teen pregnancy. Bristol makes between $15,000 and $30,000 for each appearance and made headlines in January when students at Washington University protested her high appearance fee.
Bristol Palin was engaged to Johnston, 20, in 2008 and gave birth to Tripp that December at age 18. The two called then off their engagement, became engaged again in July 2010 and broke up weeks later.
Johnston famously posed for Playgirl magazine in February 2010. He plans to celebrate his May 6 birthday at Chateau Nightclub & Gardens in Las Vegas.
In August, Johnston announced that he plans on running for mayor of Wasilla, Alaska in the October 2011 election.