Aiello v. Massachusetts

reviewing, after conviction, claims of prejudice, pretrial publicity, and hostility of grand jury | defining provocation in part as “sudden transport of passion or heat of blood” | where there is more than one proximate cause, “liability ... [is not required to] be related to any theory of joint liability” | provocation evidence must show that reasonable person “would not have ‘cooled off by the time of the homicide” | availability of unprejudiced petit jury at trial obviates need for appellate review of grand jury | "Simply because a witness alters some portion of his testimony at the time of trial is not a sufficient reason to conclude that the new testimony is false, or that the Commonwealth knew or had reason to know that it was false"