Teenage girl killed in Arcadia; suspected shooter critically injured in Pasadena

• A teenage girl was fatally shot in an Arcadia home by a man she had been dating.
• The suspected shooter attempted suicide in Pasadena after the shooting.
• Two people are confirmed dead, including the teenage girl.
• The police investigation is ongoing across Arcadia and Pasadena.
• Authorities are working to determine the full circumstances of the incident.