Lunde Murder Case

Amber Alert Sarah Michelle Lunde
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The sex offender charged in the slaying of 13-year-old Sarah Lunde pleaded not guilty in court Friday.

An attorney for 36-year-old David Onstott entered the plea on his client's behalf to charges of first-degree murder and attempted sexual battery.

Hillsborough State Attorney Mark Ober filed a document Friday notifying the court that he will seek execution for Onstott if he is convicted of first-degree murder.

The massive, week-long search for Sarah captured the nation's attention last month.

Her partially clothed body was found April 16 in an abandoned fish pond near her family's mobile home in Ruskin. She was last seen shortly after returning home from a church trip April 9.

Authorities say Onstott confessed to strangling Sarah after the two got into an argument.