Police believe Loibl -- who is from St Petersburg, Florida -- traveled to Grimmie's concert in Orlando Friday night specifically to shoot her.
The shooting took place at Pulse, a gay nightclub in Orlando.
A man opened fire on her when she was signing autographs after a concert in Orlando. The 22-year-old singer died in a local hospital.
Hillary Clinton, the former US secretary of state, offered a tweet signed "-H" to indicate it was from her personally.
Here's a recap of all the events that shaped the world from the previous week.
Omar Mateen, the Afghan-origin gunman who killed at least 50 people at a gay nightclub in Orlando in US' deadliest mass shooting incident, pledged allegiance to ISIS in a phone call to emergency number 911 during the attack.