Here are monologues from the play "The Mystery of the Gangster Ghost" (a good script for a murder mystery dinner theatre).
"LEFT ME FOR DEAD" over dramatic monologue for female
"I HAD A FLING" over dramatic monologue female
"I WOULD HAVE STABBED MYSELF" overdramatic monologue for male
"SOME SORT OF TRAP" overdramatic monologue for male
"I WANT MY LIFE BACK" short overdramatic monologue for female
"USING WOMEN IN NEED" overdramatic monologue for female
"KNOWING HE'D KILLER HER" overdramatic monologue for male