userdel: user vivek is currently used by process 749 error and fix on Linux

I am trying to delete a user named vivek using the userdel command as follows

userdel -r vivek
userdel: user vivek is currently used by process 749

How do I fix this problem and delete username vivek on a Debian Linux 9.x server?
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Ubuntu Linux: Add a User To Group

How do I add a user to group under Ubuntu Linux operating system using command line options?
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Linux Show The Groups a User Is In

How do I find out what groups I belong to under Linux operating systems?
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Linux / Unix Shell Script: Get Current User Name

I am working on a shell script. I need to find out the current user name. How do I find out the current user name under Bash or Ksh shell running on Linux or Unix like operating systems?
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Linux / Unix id Command Examples

I am a new Linux and Unix system user. How do I find out the user and groups names and numeric IDs of the current user or any users on my server? How can I display and effective IDs on the system using command line options? In Linux, how do I find a user’s UID or GID?
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Linux: Find Out My Group Name [ Group Memberships ]

How do I find out the group name under Linux operating systems using bash shell prompt? How do I display group information for the specified USERNAME under Linux?
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CentOS / Red Hat: Sudo Allows People In Group Admin To Run All Commands

I like the way Ubuntu Linux works – all people in admin groups should able to run all commands after running it via sudo “command-name”. How do I setup sudo under CentOS or Red Hat Enterprise Linux to allow all members of the ‘admin’ group to run all commands?
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id command