Only a few months after Capone's conversion, dementia set in. Even with a degenerative mental illness, he continued to profess Christianity until his death in 1947. He was buried in a consecrated cemetery reserved only for believers. When the Catholic church was questioned about their decision to allow Capone to be buried next to his father in the consecrated cemetery, the priest replied that the Catholic church recognized Capone's penitence (repentance) and salvation.
March 24, 1939 edition of the Los Angeles Times. This article was also ran by the St. Petersburg Times on March 25, 1939.
It is widely accepted that Al Capone was a notorious mobster responsible for much crime including -although it has never been proven! - the St. Valentine's Day Massacre, where 7 gangsters were gunned down with each one having no less than 15 shots fired into them (photo of actual crime scene shown below).
According to the Bible, God offers salvation to anyone who will accept it (John 3:16), and because we have all screwed up everyone needs salvation. (See Romans 3:10-12 and 3:23). God sent his son, Jesus, to die for us (Romans 5:8). If we accept Christ as our Savior, it doesn't matter how terrible our past is -- the future is bright (Romans 8:1). This verse reads, "So now there is no condemnation for those who belong to Christ Jesus." This promise is good for everyone who belongs to Christ -- it doesn't exclude anyone because of their past.
If you've ever wondered exactly how to get from being where you are now to being a child of God, it's pretty simple. A sincere prayer in your own words reflecting what is on your heart is all that is necessary. I've provided a sample prayer here, but you can use your own words.