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Hester had asked people who noticed anything \"that didn't look right\" on the trail the day of the incident, as well as the days leading up to and after it, to come forward.

\"The behavior, in my opinion, was so heinous that I would imagine that the subject would be displaying behavior symptoms that just would look out of place,\" he said.

In a sign posted on the trail, police are also now warning people not to walk alone and to report suspicious activity.

\"PHOTO:
Phoenix Police Department
PHOTO: The Phoenix Police Department released a video of a suspect sought in connection with Lauren Heike's murder.
>

Lauren Heike's mother described her daughter as \"beautiful inside and out\" and someone who had a \"kind heart.\"

\"Everybody who met her loved her,\" Lana Heike said. \"She was super funny. She was just a sweet child.\"

Lana Heike said she spoke to her daughter every day, and every call or text ended with, \"I love you, mom.\"

\"We just want the world to know what a sweet person she was, and what she meant to us and to our family. And what a void it is for us,\" Lana Heike said.

\"I'm begging people to come forward,\" she said.

Lauren Heike's family came in from Washington state to attend Wednesday's emotional press briefing.

\"I just hope they can find whoever did this to her,\" her father, Jeff Heike, said.

ABC News' Marilyn Heck contributed to this report.

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