Alec Baldwin
Alec Baldwin's stalker was imprisioned last year and recently freed.

Writings in the notebook also suggested Corbett had been watching Bullock's house for days, as the LA Times reports. He had also managed to enter the house despite the security fence and cameras. Detectives assumed Corbett had somehow managed to scale the security fence and entered the house through a rear patio door. Corbett claimed he was actually doing the actress a favour by breaking in to her house and merely wanted to show the security Bullock had in place was inadequate. 

Yet the danger Corbett posed to the 49-year-old actress was even more evident when LAPD officers searched his house and discovered, asCNN reports, a vast number of weapons including six illegal machine guns. Corbett has been charged with 19 felony counts including seven counts of possession of a machine gun, two counts of possession of an assault weapon and 10 counts of possession of a destructive device. If convicted, Corbett could face up to 12 years in prison. 

There has been an alarming number of stalking incidents reported over the past few years and those who have been affected include Ellen Page, Selena Gomez, Jennifer Lopez, and Alec Baldwin. A number of the people convicted on stalking charges have been receiving psychiatric treatment including Gomez's stalker, Che Cruz, who was ordered to seek treatment in a psychiatric facility last month. 

Read More: Alec Baldwin's Genevieve Sabourin & Other Celebrity Stalkers.

Selena Gomez
Selena Gomez's stalker has been ordered to obtain help at a mental health facility.

Jennifer Lopez
Jennifer Lopez's stalker lived at her Hampton's house for almost a week before security discovered him.