In September 1942, Kennedy transferred to his third boarding school, Milton Academy , in Milton, Massachusetts , for eleventh and twelfth grades.  His father, Joseph Kennedy Sr., wanted Kennedy to transfer to Milton, believing it would better prepare his son for Harvard.  At Milton, he met and became friends with David Hackett . He invited Hackett to join him for Sunday mass. Hackett started accompanying him, and was impressed when Kennedy took it upon himself to fill in for a missing altar boy one Sunday.  Hackett admired Kennedy's determination to bypass his shortcomings, and remembered him redoubling his efforts whenever something did not come easy to him, which included athletics, studies, success with girls, and popularity.  Hackett remembered the two of them being "misfits", a commonality that drew him to Kennedy, along with an unwillingness to conform to how others acted even if doing so meant not being accepted.  Kennedy's grades improved.
After a two-month trial, Sirhan was convicted of Robert Kennedy's murder on April 17, 1969, and six days later, he was sentenced to death.  The sentence was commuted to life in prison in 1972 after the California Supreme Court , in its decision in California v. Anderson , invalidated all pending death sentences imposed in California prior to 1972. Since that time, Sirhan has been denied parole fifteen times and is currently confined at the Richard J. Donovan Correctional Facility in southern San Diego County.  Sirhan's lawyers have claimed that he was framed, and Sirhan claims to have no memory of his crime.