James Ramey's charged with aggravated murder in death of Amanda Mangas.
Suspect James Ramey got summons, was not arrested.
FBI, other law-enforcement agencies assisted in 4-month investigation.
Police believe she headed to the Toledo and Holland area.
Prosecutors say he had a sexual relationship with a student.
Ashley Sayarath, David Sayarath were found dead in home.
Officials did not say what caused them to believe former student was a threat.
Authorities ask residents to be on alert for teen missing since Saturday.
State sets actual limit at 50 mph for road entering town.
Part of Severe Weather Awareness Week.