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An Arizona Department of Transportation sign gives a hotline number for information on the recent freeway shootings as motorists pass under at the 202/I-10 intersection, Wednesday, Sept. 9, 2015 in Chandler, Ariz. Authorities are investigating nine shootings of vehicles over the past two weeks along I-10 in Phoenix. A truck's passenger window shattered on a Phoenix freeway Wednesday as Arizona authorities investigated a string of highway shootings that have rattled nerves and heightened fears of a possible serial shooter. (AP Photo/Matt York)
An Arizona Department of Transportation sign gives a hotline number for information on the recent freeway shootings as motorists pass under at the 202/I-10 intersection, Wednesday, Sept. 9, 2015 in Chandler, Ariz. Authorities are investigating nine shootings of vehicles over the past two weeks along I-10 in Phoenix. A truck's passenger window shattered on a Phoenix freeway Wednesday as Arizona authorities investigated a string of highway shootings that have rattled nerves and heightened fears of a possible serial shooter. (AP Photo/Matt York)

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    Who is the Phoenix highway shooter?

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Who is the Phoenix highway shooter?

Jim DeFelice, co-author of "American Sniper", discusses the profile of the Phoenix highway shooter.

Who is the Phoenix highway shooter?

Jim DeFelice, co-author of "American Sniper", discusses the profile of the Phoenix highway shooter.