Numb3rs - Season 2 - Eps 3: Obsession
The FBI becomes involved in the stalking of a popular singer after she is threatened by an intruder in her house and reveals a series of threatening letters she's received through the mail. Charlie determines the letters are from two different people after analyzing the handwriting. When a photographer is found dead near the singer's house, Don believes the photographer was murdered and his death is somehow related to the stalking case.
About Numb3rs

Title: Numb3rs
First Air Date: 2005-01-23
Last Air Date: 2010-03-12
Status: Canceled
Rating: 7/10 (from 387 votes)
Language: EN
Seasons: 7
Total Episodes: 118
Network: CBS
Genres: Crime, Drama, Mystery
Production Companies: Scott Free Productions
Synopsis
Inspired by actual cases and experiences, Numb3rs depicts the confluence of police work and mathematics in solving crime as an FBI agent recruits his mathematical genius brother to help solve a wide range of challenging crimes in Los Angeles from a very different perspective.
Cast

Rob Morrow
Don Eppes

David Krumholtz
Charlie Eppes

Judd Hirsch
Alan Eppes

Alimi Ballard
David Sinclair

Peter MacNicol
Larry Fleinhardt

Navi Rawat
Amita Ramanujan

Aya Sumika
Liz Warner

Sophina Brown
Nikki Betancourt

Dylan Bruno
Colby Granger