This is the 3908th most frequent German word.
tatverdächtiger
"Tatverdächtiger" means "suspect" (a person suspected of a crime).
Here, 'Tatverdächtige' is the subject of the sentence and is in nominative case, directly referencing the person suspected of the crime.
Der Tatverdächtige wurde von der Polizei verhört.
The suspect was interrogated by the police.
'Tatverdächtigen' is in accusative case, referring to the object of identification by 'Sie'.
Sie hat einen Tatverdächtigen als Täter identifiziert.
She identified a suspect as the perpetrator.
In this instance, 'dem Tatverdächtigen' is in dative case, indicating the indirect object of the verb 'sprachen'.