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PLANO - Plano police held a news conference Friday morning to ask for the public's help in finding a suspect in the death of 40-year-old Susan Loper.

While the investigators are not saying much, they say they are narrowing the list of suspects. They stopped short of saying Loper's ex-boyfriend is on the list. No arrest have been made in the case.

Police are at a critical stage of the investigation and that is why they are asking for the public's help in providing information about the day they found her abandoned white RAV 4 truck in a Plano apartment complex on Tuesday night.

They are looking for witnesses who saw a 2004 black Cadillac Escalade that was seen in the area of the 2500 block of Preston Road between the hours of 3 a.m. to 7 a.m. Anyone who saw that vehicle near the area

All information, small or large is very important to us right now, said Rick McDonald, Plano Police Department. Any information that someone has that they may think this is not important cause it s a small piece of information may be one of the missing links that we want.

Plano police spokesperson Rick McDonald would not say how Loper was killed and would not name the murder weapon.

McDonald did confirm police issued several search warrants to search the homes of suspects soon after finding Loper's body in a wooded field off the Dallas North Tollway on Wednesday.

Loper first turned up missing Tuesday from a Plano country club where she was expected to teach an early morning Pilates class. That never happened.

Police believe she was kidnapped, and then killed. They also say they found signs of a struggle.

Loper was a single mom raising an only son, 8-year-old Jake. The two lived together in Frisco.

Texas Rangers are assisting with this round-the-clock murder investigation.

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