The 26-year-old Manteca man who was involved in a collision with a pickup truck Monday afternoon on East Louise Avenue some 100 yards east of Main Street died at San Joaquin County Hospital.Manteca Police investigators were back on the scene Tuesday afternoon taking additional measurements at the crash scene in an effort to determine the exact cause of the crash between a late model motorcycle and a F-250 Ford pickup truck. Officers were also talking to witnesses for a second time following the fatal incident, requiring more time to finish their investigation. Police did not immediately release the names of the drivers or the cause of the collision and will not until the formal report is ready to be released in about two weeks, police said.