From the University of Texas Jackson School of Geosciences: A computer model simulating how an asteroid impact formed the Chicxulub crater. The light grey represents the Earth's crust. The dark grey represents the upper mantle.

It seems that a panel of 41 scientific researchers (see the article abstract for a listing of participants), after studying all of the evidence for various dinosaur demise theories, have recently published an article in Science Magazine that concludes that the Alvarez asteroid theory is the most likely explanation for the dinosaur extinction that occurred 65 my ago ...

You can read about it here if you don't subscribe to Science Magazine: A Theory Set In Stone. This appears to me to be the most definitive conclusion yet regarding the Alvarez theory. Of course, science does not preclude a re-evaluation if ongoing (such as the one in Antarctica) or future studies uncover contradictory evidence.

Here is one depiction of the Chicxulub crater showing its approximate location on the Yucatan Penninsula:

Below is a gravity anomaly map of the Chicxulub impact structure. The accompanying USGS description reads, "The coastline is shown as a white line. A striking series of concentric features reveals the location of the crater. White dots represent water-filled sinkholes (solution-collapse features common in the limestone rocks of the region) called cenotes after the Maya word dzonot. A dramatic ring of cenotes is associated with the largest peripheral gravity-gradient feature. The origin of the cenote ring remains uncertain, although the link to the underlying buried crater seems clear."