we told you about that colorado lawman, the husband shot in cold blood on his front porch as he answered his doorbell. then, last night here, the shootout in texas. authorities believe they had their suspect, they shoot and kill him. tonight, they want to know if he was behind yet another notorious killing in broad daylight. one just a few weeks back and never solved. abc's senior justice correspondent pierre thomas on this fast-growing case again tonight. >> reporter: tonight, there's intense focus on this young man as a possible suspect in the execution-style murder of colorado's corrections chief, tom clements. and we now learned police are investigating whether he could be tied to the high profile murder of another law enforcement official. police identified 28-year-old