The one investigation I came across was of the little girl Madeleine McCann, age 3 who was kidnapped from a hotel earlier this year. Police have a suspect, however they do not have any real evidence to arrest him. All they have done to suspect, Robert Murat, 33, is question him. He is not even behind bars and so far into the investigation there are no other suspects.
In the case of 2 brothers who were shot today and the crime is reported and being investigated. Since it is very current there really is no suspect reported until a witness comes forward or fingerprints reveal anything.
Every crime story progresses differently due to the difference in victims, crime committed, weapon, witnesses, etc.
Even though these reports were filed months apart, the situation of the suspect remains ideally the same, vritually unknown. However, once a hint comes up it then turns to the journalist to report it and add to the story.