25 vs 18? That's nothing! We just had a multiple murder case about 60 miles East of where I work. Seems that a 12 year old girl and her 23 year old "Boyfriend" (both of whom were into Goth culture and websites) murdered her parents and her 10-year old brother. Conjecture is that the parents disapproved of the "relationship"!!!! Fortunately the pair didn't get far before being arrested. They've now added a third arrest... an 18 year old girl charged with "Accessory after the fact" (apparently either helping the escape, and/or providing false "evidence").
http://news.yahoo.com/s/cpress/20060...e_bodies_found
I guess the parents paid the ultimate price for failing to supervise their daughter's activities.