CLAY COUNTY | A man shot and killed himself shortly after being pulled over by a Missouri Highway Patrol trooper Friday afternoon in the Northland.</p><p>The trooper stopped the man for a traffic violation about 1:35 p.m. on southbound Interstate 29 at U.S. 169, according to Highway Patrol Sgt. Dan Green.</p><p>After contacting the driver and obtaining his identification and insurance cards, the trooper returned to his patrol car. When he walked back to the man&#8217;s pickup, he found the driver slumped forward inside with a single, self-inflicted gunshot wound.</p><p>The Jackson County medical examiner pronounced the man, identified as 56-year-old William D. Peck of Kansas City, dead at the scene.</p><p>Officers from the patrol&#8217;s Division of Drug and Crime Control responded to the scene to investigate the incident.</p><p><strong><span class="subhead">KANSAS CITY | 22 arrests at checkpoint</span></strong></p><p>Police and Missouri Highway Patrol conducted a sobriety checkpoint this weekend.</p><p>The operation was from 9 p.m. Friday to 5 a.m. Saturday at U.S. 169 and Lou Holland Drive.</p><p>Officers stopped 1,670 vehicles during the checkpoint and arrested 22 motorists for suspected driving under the influence of alcohol. Authorities also arrested one federal felon in possession of a firearm and one for state possession of cocaine, one for driving while license was revoked, one for driving with a suspended license, two for state warrants for driving under the influence and three for Kansas City warrants. They also issued two hazardous moving violations and two other unspecified traffic violations.</p><p><strong><span class="subhead">KANSAS CITY | Police investigate homicide</span></strong></p><p>A Kansas City man was shot to death Friday as he left a house.</p><p>According to police, Mark A. Palacio, 32, was walking out of a home in the 5500 block of East 23rd Street about 6:30 p.m. when someone shot him.</p><p>Investigators were not sure if the shooter was in a vehicle or on foot.</p><p>Anyone with information should call the TIPS Hotline at 816-474-TIPS (8477). All calls are confidential.</p><p><strong><span class="subhead">CLAY COUNTY | Teen killed in crash</span></strong></p><p>A 17-year-old boy was killed and two others seriously hurt when their vehicle failed to yield and collided with another vehicle Friday afternoon.</p><p>The driver of the second vehicle also was seriously injured. The wreck occurred at 3:35 p.m. on Missouri 210 at Route JJ.</p><p>The teens&#8217; vehicle failed to stop at a stop sign on JJ and collided with a vehicle traveling east on 210, according to the Missouri Highway Patrol.</p><p>Benjamin J. Gray of Missouri City died at the scene. The driver, Andrew J. Asmus of Excelsior Springs, and another passenger, Cory W. Roush of Missouri City, were taken to a hospital with serious injuries. None of the boys was wearing a seat belt, the patrol reported. The driver of the other vehicle, 49-year-old Daniel C. Shute of Bramer, Mo., also was taken to a hospital.</p><p><strong><span class="subhead">KANSAS CITY | Wreck leaves one dead</span></strong></p><p>A man died in a single-vehicle accident in Kansas City early Saturday morning. Justin Williams, 24, of Raytown, died in the accident that occurred about 3:30 a.m. on Lee&#8217;s Summit Road just south of U.S. 40. He lost control of his vehicle, causing it to crash into a ditch, police said.</p><p>No further details were available Saturday evening.