Chicago Lottery Winner Died From Cyanide Poisoning

Police investigate death of $1 million jackpot winner Urooj Khan, 46, as a homicide.

00:24 | 01/07/2013

Transcript for Chicago Lottery Winner Died From Cyanide Poisoning

-- -- now believe the death of a lottery winner. Here's a case of murder by poisoning a rouge -- of Chicago died just one day after winning a 425000. Dollar jackpot. -- first his death was believed to... See More

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'20/20' 12/14: Tragedy at the Elementary School: What Happened in Newtown, Conn.

Tragedy at the Elementary School; Fallen Teacher's Story; Why Did Adam Lanza Snap?

Tragedy at the Elementary School: What Happened in Newtown, Conn.

Part 1: The gunman, the hero teacher and other details of the Sandy Hook Elementary School shooting.

Why Did Adam Lanza Snap?

Part 2: Shooter was "a little bit different - kind of repressed."

Tragedy at the Elementary School: Fallen Teacher's Story

Part 3: Teacher Vicki Soto's cousin tells ABC News' Chris Cuomo about her dedication to the end.

Tragedy at the Elementary School: Surgeons

Part 4: As surgeons at Danbury Hospital treated the injured, they wondered why more weren't coming.

Tragedy at the Elementary School: Clergy Help Heal

Part 5: Members of the clergy help to explain and help town recover after shootings.

Tragedy at the Elementary School: Extraordinary School

Part 6: Before today, Sandy Hook Elementary was notable for all the right reasons.

Tragedy at the Elementary School: Loss of Innocence

Part 7: Adam Lanza's bullets burst open the normally innocent world of children.

Tragedy at the Elementary School: Social Media Reacts

Part 8: Deborah Roberts looks at people's reactions online to the shooting.

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