The following steps detail how you delete a lead:
Go to the left pane
Click Analytics - All Properties
Click Columns and select Show All
Click Filters and select Remove All
Head over to the Actions column and select the Blue Trash Icon
Select Yes to delete the Lead
If the Trash Icon is in Grey, select anywhere in the same line as the Lead, marked as Blue
Click the Edit button next to General Information
Click Lead Status and select Dead, and click the Save button
