I've not tried fn_dblog on Express but if it is available the following will give you delete operations:
SELECT
*
FROM
fn_dblog(NULL, NULL)
WHERE
Operation = 'LOP_DELETE_ROWS'
Take the transaction ID for transactions you're interested in and identify the SID that initiated the transaction with:
SELECT
[Transaction SID]
FROM
fn_dblog(NULL, NULL)
WHERE
[Transaction ID] = @TranID
AND
[Operation] = 'LOP_BEGIN_XACT'
Then identify the user from the SID:
SELECT
*
FROM
sysusers
WHERE
[sid] = @SID
Edit: Bringing that all together to find deletes on a specified table:
DECLARE @TableName sysname
SET @TableName = 'dbo.Table_1'
SELECT
u.[name] AS UserName
, l.[Begin Time] AS TransactionStartTime
FROM
fn_dblog(NULL, NULL) l
INNER JOIN
(
SELECT
[Transaction ID]
FROM
fn_dblog(NULL, NULL)
WHERE
AllocUnitName LIKE @TableName + '%'
AND
Operation = 'LOP_DELETE_ROWS'
) deletes
ON deletes.[Transaction ID] = l.[Transaction ID]
INNER JOIN
sysusers u
ON u.[sid] = l.[Transaction SID]