Look for the job in timer job definitions, in C.A, operations.
Once you click on the job, there will be a delete option. To use the command line correctly, remove the 2%D and copy the id, or run stsadm -o enumdeployments.
To force scheduled jobs to start:
stsadm -o execadmsvcjobs
To cancel a specific job being deployed:
stsadm -o canceldeploymeny -id [JOB_ID]